Sub-critical carbon dioxide extraction of the hexane extract of the leaves of Tasmannia Lanceolata
Sub-critical carbon dioxide extraction of the hexane extract of the leaves of Tasmannia Lanceolata
复制标题
DOI：
10.1080/10412905.2015.1083488
复制
发表时间：
2016-01-02
影响因子：
3
通讯作者：
Menary, Robert C.
中科院分区：
文献类型：
--
作者：
Garland, Sandra M.;Menary, Robert C.
研究了在亚临界温度和压力条件下，用液态CO2萃取塔斯马尼亚浸膏的工艺。中试规模的提取器进行了修改，包括第二液体计量泵的再冷凝的CO2的再循环。相平衡是控制油提取速率的热力学因素，而质量平衡传递控制较低分子量、非极性单个组分的溶解度。作为最重和最高含氧组分的蓼二醛具有与低级单萜不同的表观溶解度，并且在大约110巴的压力和20 ℃至24 ℃的温度下观察到该二醛的溶解度最小值。当接近临界温度和压力时，与液态二氧化碳相关的密度的大变化提供了更高的提取选择性。
The extraction of Tasmannia lanceolata concrete using liquid CO2 at sub-critical conditions of pressure and temperature was investigated. A pilot-scale extractor was modified to include a second liquid metering pump for the recycling of the re-condensed CO2. Phase equilibrium was the controlling thermodynamic element in the rate of oil extraction while mass balance transfer dominated the solubilities of lower molecular weight, non-polar individual components. Polygodial, as the heaviest and highest oxygenated component, had a different apparent solubility to the lower monoterpenes and a solubility minimum was observed for this di-aldehyde at pressures in the order of 110 bar and at temperatures of 20 degrees C to 24 degrees C. The large variation in density associated with liquid carbon dioxide as it approaches critical temperature and pressure provides for higher selectivity of extraction.